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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95a9174c7c7a4de4fcacab3064d2bd037e995a8fef6c794d61da00b4da937375' 
  AND token = 'LI1DKG8q9lhTQISd3Ao3q4NHWn/FzKBOw4+gzQwYdWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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