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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3862827ec6641edd8d2056126cad745a27346511cee865a8d7998998c3fb03a' 
  AND token = 'giS8E53J2G49l2pieR5WLwo7uMcJEIkfHN3DPcLbsjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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