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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98362d72b0b7cb7e7e3b740d0b3ebe7bb8bb959dd34a71938680494da6619964' 
  AND token = 'srs5M/b4D7kEs3GyK8l22ZX65ksUZGfepKnjTYu5hsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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