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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '031fee6db52f293911c2faa7c5946710b196b83af6cf7fcaf874c2584503e8e2' 
  AND token = 'wfqoE2YwugENB591V1RpDrEN0zQoxK/cQlxj41/U7KE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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