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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e37fbc4b4d21be12f9751f1ff2c2a2c62ffbb777a3b80405c67fcdd941b0dfa' 
  AND token = 'TfhTcm0nvFOp84SxsteD+VL+nMvggDjA5c0Neg7toi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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