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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd173a41aebac2b47f04d7a601e38ec9c77975c5e6f741915b716a62138732e8c' 
  AND token = '4ZuwQQxeQ+NcA6f2L7iRFhr5h5M6+bQNPWGSENRzL1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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