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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a02d5b2f4ff312ed2bdd73366a998cd9ef4c4ec559f4d8a7349cd732d241fc1' 
  AND token = 'IMcMCrsHX0GKsnYz/cRnyFR2Rlfc/r/pGR7KSrDEoBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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