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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a35ae90af6093e9bfb5746101a09b9eb9195eaab8dfa5c9dd3f7fbb413f0660e' 
  AND token = 'B8dGnLRsjLbcUF42w4ty6jQuO/f6Iry3Gj1u1SfyfkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}