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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2ea271344f9e88ff492b11a0997f2ea1dc3b9fba1c8be383c7c54de5341710b' 
  AND token = 'C0VFAMafKXniPTctMZLAvV6EYEgKVbaUTjg3ajjw/mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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