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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fb174b7f817e5cb8e3b9dc83e06ce5167eb14f8ea084d36faad74c1caf4d1c5' 
  AND token = 'mcbWiCTkXY5a5ntOtWXrJ9JIpp70Px+V7zZFMGSBxtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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