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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78a03d056369681dbf09f5aa88e7a06936205306f5d83e7661647471dfdb5cc8' 
  AND token = 'AIuinU6HG1fCkAVA22U5S/ekFnloN6HCZjJi2u2U3uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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