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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5888e8da1db6e27b62e65ad0d7c6741068f2d4ebae413816ff3f2abf986f4a0' 
  AND token = 'eudrHsQEseiLFE9PkqxG2QZq+zw4TYyfaLDXgGryxew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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