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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bf108d956af07cc1fce6a5a573a6635e0835dbeb082eccc32a2fafc45ea583e' 
  AND token = '9ltxorW21dB2HNlSK0LpCS6MnedVT3DBCM7I0aKnwhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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