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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '559bbedb7977c096fc81382d80961f9f0f31743d1c869a000c0b4066d0195014' 
  AND token = '9D/5Q+8BezvSYWzCRXjav2zMvL/mY8d4BYjwnwmnv1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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