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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '105572221459db83bb0b8fa1f20bc4cdf264bae65e16c2c6e6deee5165921cfc' 
  AND token = '7vBCS9T0b2L8CZfToUnRP6QQQeW2FpchiTEDkZCBNM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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