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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed141273fca25c2d56ccbf168d7a907775cf10dc1b09ef14dea1157e9c1c896e' 
  AND token = 's6lcA1UxD0a8KcG6gJCY7j045OsoeNWgRvLu/VZ1RWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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