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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c005ae6bbf8f2d34c964532b33ed3a49ddb46cfba3980a7fab9f63a4ad2c5a8a' 
  AND token = '19f6H5ZvuJlxrcuEWA1/sIKyu+NE6srXf3g3sklNtdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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