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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4774a020203598671e805c7044358c9283c41ee76bf210f5e4e78b5050c6ca7d' 
  AND token = 'I1rLJbcrByiwtJ5k7AJbTuBqLZpWLcXMEPO6wph4uls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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