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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab6ba3fb13457655045a6fbff3644e1db467f14489005e0eec9fc4be843bf9b3' 
  AND token = 'GS1ulRv8o+g2FODOyN2G0Ka+/qQLX4UfOckNrazudcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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