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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd62ed2dbf447640756af232e16b80eb253b68d11dba7dea6a5bc0859f334d394' 
  AND token = 'P8akLla2X4/XN+K3EUV6lgXOwndxKfGLmBgQzKivPE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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