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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '936c1e752c14d240cb710e02c207ba8068ec9edf12218534b1a139fa8bab07dc' 
  AND token = 'blzKENxPn1N9/tUu7YQoTvHzb7vKHBL/qz46nK4/f+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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