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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '322db49da03223883302ab5232afed74a8e836c7d6aba95973e345881647e0d7' 
  AND token = '8P3EKsyFulF+VD2Xo4lBDH3yqSCMCW7U1vy7ctyvPLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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