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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80d18b1a72b26a1cf0058a4c173e9e6564e91200f8f3b569d77943f33977bd2a' 
  AND token = 'AWhC9jsrK82k9lnO5dDryN13K2euxlfaoHilKIFsGTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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