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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b20753e7c56f2bb144dd17e03a8a8e84193121d1d46905e358445aa078517d8' 
  AND token = 'sfDNBUT9nkK800oZYy1gBGcvM1Cc5fDXQpPR79I2I68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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