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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e82a77d4ded98fbd2476278eb334b10cfed83a12375cdb8ad7d4b0f77e3a9bb3' 
  AND token = 'evjvijPQLxUlRv+kzZmiBY3Al+G7hl40KzIv5TT7Xr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00186

JSON explain

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