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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a08b3b2dff2b84ed05a2ff3dcc35afd4a19c2cf3f1e458e82ec9a7f91306a1a' 
  AND token = 'oP5d5ogg/G58GlXd7UBffsPP/TFB1IjmGpHMO0sAJs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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