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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '009949d0879a4c69744a85067aada6539d92ff9352405fee986873d068ea92ce' 
  AND token = 'k5gQ1BlxLph1+kOqXh4wgUhktsqbyeT/7NBSikam4zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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