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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '987c3640cacf4ff174145220547776b1ce0449c05592d8f376cc63f434739cc6' 
  AND token = '3wxX2AuW5ZZcV5fGWG4K7baBW/0TiBaiY8BbGLmIKRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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