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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9838b74cdac68126d66b04fee8c0989ceb5bb844b75f887164ecc378b3e6c9e' 
  AND token = 'fbtg39bXZU+NI9+tNwwoN0ytR/cJojMtFtFi28BlkxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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