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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccdf95cfc5a0cc7d066698dfb3bb8f8e36b0d014bee343816b6342fbeb92a6f8' 
  AND token = 'a4RZIAt1i6l+/TGK39w1uJxOHQuU56e9GHESFlwfcKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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