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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9a1dc1ee5e817d47492eb7fe9dfd3eb9fca814f6d67a98f98ddc4ad96702e66' 
  AND token = '4w7f3A148SbfBhoaEadnxmwX+bX4H0pn87Xf6f+WOrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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