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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cca5dbaaa84925dcc8164829283d3c3a846c46d17acf6ba7e8bc9ca590ad2d54' 
  AND token = 'Y4GT5ShPi+4irKG3OnVsX3EmDXFr4LKc3gAreO0grlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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