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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72a572a9ed4e362b87f61ba9d88480172c2e18a62f1a756ab45149fa2ee8b762' 
  AND token = '3J/1nk5BPEBH+7r91gOecMN1FCRPhyUd1fzILByAFFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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