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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39b06e6a0f90585553ac1b8d9a632d6980e54e39163982c970a6a2a67f8e82e7' 
  AND token = '4lZmp5HrTuJO91tiqe98wkX9SDTNpBffzLQwj04SUao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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