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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a94f11241d04abf24360d5663ac6ea9e20073c77a227e8f6f46fdcce2a0aafa3' 
  AND token = 'M9CZdDaT+rIu6vrp+M1id+ewL54v/IQtzWfJkB5hlTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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