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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '338491df8cebf2422beffaba359e9e5a69d6857ef29431dc84ca62f0a52a1f3c' 
  AND token = 'R5cVcKVqFprVoVYy99J5EjI0YV234kecpdg+w7PHmeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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