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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f112c09159700d0c5b2a4815e75fa49f9e74e2c2e26a7731b08577f387c395ec' 
  AND token = 'C2OEs1mKdbLY2GXaMFfd2wP/Oj+rau1/75BC7sraeJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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