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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b21ac07f3f0383dad0f88e27d3eee05a90f95938d2b38db80c2cd7a2df3574c8' 
  AND token = '3mO/nLqMIyoy9CTdb3/5UibGANzN3n74ZGS61SPiX14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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