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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29912e96290b731c14aa30368e623fb3b3ff17c265557563ef8571797260fa7f' 
  AND token = 'kRRjK/5289VJC2fF/o8JWORfwleGJWGS3o2fQyvmnmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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