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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc7703734365f79548bcca940c2fbe21b17be2c7722e768e824f23f79dfb6802' 
  AND token = 'B4ilBW9YzLjZ1/rhVOh7rP39AVEbB/0asa8nfGlyPOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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