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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b87e43c4885bf1ade76690ffff7497be9f3016623927130d21059ecb2d0761e' 
  AND token = 'FGleTGajwYcIfJgPWxdcA28V/F0fnUStC39ydkKb3tU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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