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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '341d32055bf960238a01064dd8ee176e4ea95dbe8544dd4b1d077ac972bcbb4e' 
  AND token = '3Evv995g5APt5qfmEft0YqUESnSal+U8KEpDCCp9RPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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